David a



(No Model.)

D. A. ARNOLD.

HEATING APPARATUS.

,No. 370,444. 3 Patented Sept. 27, 188 7.

FIEHEH WITNESSES. l JNVENTEJH.

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U N TED STATES ATENT OFFICE.

DAVID A. ARNOLD, or PAWTUOKET, RHODE ISLAND.

HEATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 370,444, dated September 2'7, 1887.

2 Application filed July 9, 1886. Serial No. 207,545. (No model.)

To all whom, zit may concern; I

Be it known that I, DAVID A. ARNOLD, a citizen of the United States, residing at Pawtucket, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Heating Apparatus, of which the following is a specification.

My said invention relatesto a combined furmace and steamgenerator for heating buildings; and it consists in the construction and arrangement of parts, as will be hereinafter described, and particularly pointed out in the claims.

The object of my invention is to provide a furnace with a central chamber immediately over the'fire-pot, which is surrounded by andshowing the pipes for supplying water and conveying steam. Fig. 3 is a horizontal section taken on the line y y, Fig. 2, of an elevated circular compartment-chamber,showing means for conveying smoke and heat currents in such manner as to warm the incoming currents of fresh air before their admission to the interior reservoir of heat.

a a show the walls of the exterior covering, and b b the walls of the furnace.

c is the firepot, with lining seen at d d.

e is the ash-pit; f, the fire-door; g, the ashdoor, and h the grate.

2' shows the interior heating-chamber directly over the fire-pot, and within which the boiler 70 is set whenever it is desired to generate steam-for additional heating. Exit from the heating-chamber i is in the line of the arrows shown in the interior of the drawings, into the elevated convolute chamber m, which consists of aspiral passage passing nearly twice around the heating-chamber i, as seen in Fig.

through the chimney-flue Z.

3, where the lighter products of combustion are compelled to follow the convolute channels m m in the line of the arrows, and to yield any heat they contain before they escape The downwardprojecting sides of the heating-chamber i are turned outward, as seen at o 0, and have the upward continuation 1) until they form the inner side of the circular compartmentr. (Seen in Fig. 3.) This upward return of the sides of the heating-chamber 1; is so arranged as to leave between said sides and the part 12 an air chamber or duct, 3, having the partition if standing therein, the top of said partition connecting with the air-deflector 10. Between the walls a b is the cold-air chamber a, which receives fresh air through flues extending therefrom to the outside of the building. The cold air so admitted passes up the chamber n, as indicated by the arrows, over the elevated circular chamber m, and through perpendicular ducts in said chamber m. (Shown at v 1),) Said air-current is then deflected by means of the inwardly-turned top of the wall a, as seen at w, and passes down on the outer side and under the bottom of the partition t and upward between the inner side of the partt and the wall of the interior heating-chamber i into the heat-reservoir y, and thence is conducted to the rooms to be heated. The conical top 2 of the chamber 6 forms a combustionchamber for the consumption of the gases generated from the fuel, and also serves as a superheater of the contents of the reservoir y.

a showsfeedwater pipe for the boiler, and b the steam-pipe leading from the boiler.

The manner of constructing my said invention and the relations and uses of its several parts will be apparent from the drawings.

It will be seen that the radiation of heat from the walls of the heating-chamber z is against strong currents of fresh air already warmed by passing over and through the perpendicular ducts in the circular compartment chamber m, and further heated by passing down the partitioned chamber or duct 6. The passage of the smoke and of the lighter products of combustion carrying heat through the winding channels m m in the elevated circular chamber on gives abundant opportunity for the outside air in passing over and through the perpendicular ducts in said chamber to withdraw therefrom all the heat brought up thither from thefire-pot and combustion-chamber aforesaid.v

My said improved heating apparatus is adapted to be used either as a furnace to supply heated air to the rooms above or as a steam-heater by adding the boiler and usual attachments, as shown in Fig. 2; or both systems of heating buildings, with all the advantages incident to each, are easily and practically combined in the apparatus Ihave shown and described. In my device these advantages are obtained at a great saving of fuel, and all the heat generated from the fuel is utilized.

I am aware that it is not new to constructa heater with channels or passages, whereby the products of combustion may be used so as to heat an inflowing current of fresh air; but I am not aware that 'the peculiar construction herein set forth, wherein a double spiral or convolute chamber, as m, has ever been employed for this purpose, the said chamber being in the upper part of the heater and the products of combustion readily passing into the same.

Having thus described my said heating apparatus, what I claim as new therein, and desire to secure by Letters Patent, is-

1. A combined hot-air and steam'heating apparatus, consisting of the double spiral or convolute chamber 6, having its walls bentoutward and upward to form a duct, 8, the partition t between said duct, the air-deflector w, and reservoir '2 said chamber '5 havinga conical top, 2, forming an intermediate combustion-chamber, and also serving to heat the reservoir, in combination with a fire-chamber, a smol e-exit, and the walls a and b, the whole constructed and arranged to operate as shown and described.

2. The cone-shaped heating-chamber t, having its sides continued and bent outward and upward, as shown at 0, to form the duct 8, and the partition I, standing in said duct, and the air-deflector w, in combination with a firechamber, a smoke-exit, and the walls or drums at and b, the whole constructed and arranged to operate as shown and described.

3. The elevated convolute chamber in m interiorly connected with the fire-pot and combustion-chamber, and having therein the convolute vchannels m m, passing twice around the heating-chamber 6, through which smoke and the lighter products of combustion are conducted, and provided with the transverse perpendicular ducts v v, the deflector w, and the air'flue n, in which the chamber is set, whereby air is made to pass over it and through its ducts for the purpose-of absorbing and utilizing all the heat carried upward from the fire-pot and combustion-chamber, in the manner shown and described.

4. A combined heater andboiler consisting of the outer casing, a, having side openings at the base, an interior furnace having walls I) and fire-pot c, theinterior heating-chamber, z, I

having walls with upward continuations p, and the conical top 2, the convolute chamber m, having spiral passages m, and outlet-pipe Z, the deflector w, and partition t, the latter forming with the walls of the inner chamber, 1', the duct 8, and the boiler 70, located within said inner chamber, 6, and having inlet and outlet pipes ab, all of said parts combined and 7 arranged to operate as shown and described.

DAVID A. ARNOLD.

\Vitnesses:

THOS. P. BARNEFIELD, WM. H. CLAPP. 

